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Mr Deane said: "Boris must surely feel the hand of history on his shoulder at this pivotal moment.

"His involvement in the campaign to lead Britain out of the European Union could tip the scales.

"Come on, Boris. Be brave. Back Brexit!"

GETTY

Johnson has been tipped to replace Cameron as Prime MInister

Last night Mr Cameron's campaign to keep Britain in the EU suffered a major blow as Mr Gove sided with the 'out' campaign.

The Prime Minister said he was "disappointed but... not surprised" by the former Education Secretary's decision.

He added: "Michael is one of my oldest and closest friends but he has wanted to get Britain to pull out of the EU for about 30 years."

EU referendum

Sat, February 20, 2016

With an in/out referendum on EU membership set for June 23 this year, we're taking an overview look of David Cameron's two-day visit at EU summit at EU headquarters in Brussels and his return to Downing Street to meet with his cabinet.